کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
611996 880689 2008 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Synthesis of Pt/Ru bimetallic nanoparticles in high-temperature and high-pressure fluids
کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی شیمی کلوئیدی و سطحی
پیش نمایش صفحه اول مقاله
Synthesis of Pt/Ru bimetallic nanoparticles in high-temperature and high-pressure fluids
چکیده انگلیسی

A high-temperature and high-pressure flow-reactor system was applied to the synthesis of monometallic ruthenium (Ru) nanoparticles and platinum/ruthenium (Pt/Ru) bimetallic nanoparticles using the thermal reduction of ruthenium ion (Ru(III)) and the mixture of platinum (Pt(IV)) and ruthenium ions in water and ethanol mixture in the presence of poly(N-vinyl-2-pyrrolidone). Monometallic Ru nanoparticles with an average diameter of ca. 2 nm were synthesized above 200 °C at 30 MPa. The monometallic Ru nanoparticles tended to make large aggregates in colloidal dispersions. By the reduction of the mixture solution of Pt(IV) and Ru(III) in water and ethanol above 200 °C at 30 MPa, Pt/Ru bimetallic nanoparticles with an average diameter of ca. 2.5 nm were synthesized with relatively small size distribution. The EXAFS spectra for the Pt/Ru bimetallic particles indicated that the particle possesses metallic bonds between Pt and Ru atoms in contrast to the case of the nanoparticles produced by thermal reduction under ambient pressure at 100 °C [M. Harada, N. Toshima, K. Yoshida, S. Isoda, J. Colloid Interface Sci. 283 (2005) 64], and that the Pt/Ru bimetallic particle has a Pt-core/Ru-shell structure.

A TEM image of Pt/Ru(1/1) bimetallic nanoparticles produced by the reduction of both Pt(IV) and Ru(III) salts in water and ethanol 1/1 mixture with PVP at 30 MPa and 300 °C, and the Fourier transforms of EXAFS oscillation of Pt-LIII edge and Ru-K edge for this bimetallic nanoparticle.Figure optionsDownload as PowerPoint slide

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Colloid and Interface Science - Volume 322, Issue 1, 1 June 2008, Pages 358–363
نویسندگان
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